Dynamic Text Layout Rules

1. A method comprising: at an electronic device with a display and one or more input devices; displaying on the display of the electronic device, a first text string with a first type style and a second text string with a second type style, wherein the first type style is different than the second type style; the first text string is displayed proximate to the second text string on the display with a first spatial arrangement that is determined based at least in part on the first type style and the second type style; after displaying the first text string and the second text string on the display, receiving, via the one or more input devices, input that changes a font size of the first text string and changes the respective font size of the second text string; in response to receiving the input, dynamically adjusting, by the electronic device, one or more font metrics that determine the spatial arrangement of text in accordance with text layout rules based on the first type style and the second type style; and displaying, on the display of the electronic device, the first text string and the second text string with the respective font size changed and with a second spatial arrangement that is determined based on the first type style, the second type style and the dynamically adjusted one or more font metrics.

2. The method of claim 1 , wherein receiving the input comprises receiving one or more of a user input and a programmatic input.

3. The method of claim 1 , wherein dynamically adjusting the one or more font metrics comprises: adjusting a size of a bounding rectangle of a text container object for at least on of the first text string and the second text string.

4. The method of claim 3 , wherein dynamically adjusting the one or more font metrics further comprises: adjusting one or more of a size and a shape of a text container region of the text container object.

5. The method of claim 1 , wherein dynamically adjusting the one or more font metrics comprises: adjusting line fragment padding for at least one of the first text string and the second text string.

6. The method of claim 1 , wherein dynamically adjusting the one or more font metrics comprises: adjusting a size of a display object for displaying at least one of the first text string and the second text string.

7. The method of claim 1 , wherein at least one of the text layout rules specifies an amount of leading between baselines of text strings.

8. The method of claim 1 , wherein at least one of the text layout rules specifies a linear equation.

9. The method of claim 8 , where the linear equation is a sum of a default leading and a fraction of the default leading.

10. A system comprising: a display; one or more input devices; one or more processors; and a memory coupled to the one or more processors and configured for storing instructions, which, when executed by the one or more processors, causes the one or more processors to perform operations comprising: displaying, on the display, a first text string with a first type style and a second text string with a second type style, wherein the first type style is different than the second type style; the first text string is displayed proximate to the second text string on the display with a first spatial arrangement that is determined based at least in part on the first type style and the second type style; after displaying the first text string and the second text string on the display, receiving, via the one or more input devices, input that changes a font size of the first text string and changes the respective font size of the second text string; in response to receiving the input, dynamically adjusting one or more font metrics that determine the special arrangement of text in accordance with text layout rules based on the first type style and the second type style; and displaying, on the display, the first text string and the second text string with the respective font size changed and with a second spatial arrangement that is determined based on the first type style, the second type style and the dynamically adjusted one or more font metrics.

11. The system of claim 10 , wherein receiving the input comprises receiving one or more of a user input and a programmatic input.

12. The system of claim 10 , wherein dynamically adjusting the one or more font metrics comprises: adjusting a size of a hounding rectangle of a text container object for at least one of the first text string and the second text string.

13. The system of claim 12 , wherein dynamically adjusting the one or more font metrics further comprises: adjusting one or more of a size and a shape of a text container region of the text container object.

14. The system of claim 10 , wherein dynamically adjusting the one or more font metrics comprises: adjusting line fragment padding for at least one of the first text string and the second text string.

15. The system of claim 10 , wherein dynamically adjusting the one or more font metrics comprises: adjusting a size of a display object for displaying at least one of the first text string and the second text string.

16. The system of claim 10 , wherein at least one of the text layout rules specifies an amount of leading between baselines of text strings.

17. The system of claim 10 , wherein at least one of the text layout rules specifies a linear equation.

18. The system of claim 17 , where the linear equation is a sum of a default leading and a fraction of the default leading.